Abstract: Apparatus for monitoring a building having a plurality of rooms. A plurality of beacons is each arranged to transmit a light output signal. The apparatus also comprises a plurality of waveguides suitable for deployment in the building so that each of the plurality of rooms has at least one of the waveguides arranged to receive the light output signal from one or more of the beacons when said one or more of the beacons is active in that room. There is at least one signal capture unit arranged to receive, via the waveguides, the light output signals resulting from the beacons in the rooms. A signal processor is arranged to distinguish, in use, the light output signal from a first beacon in a first room from the light output signal from a second beacon in a second, different, room.

Abstract: A building comprising a plurality of rooms (10) includes a room occupancy sensing apparatus. A light source (20) emits a series of light pulses (22), a plurality of waveguides deliver light from the light source to output nodes (60) located in the rooms, and a signal capture unit (30) receives output signals resulting from light reflected by objects in the rooms. The apparatus detects movement, of for example a person (40), in a room and ascertains the room concerned by virtue of (i) detecting a difference between the shape of the waveform of the signal (24 i) received at the signal capture unit (30) in response to a first emitted light pulse and the shape of the waveform of the signal (24m) received at the signal capture unit in response to a second emitted light pulse and (ii) relating said reflected light pulses to the appropriate output node and therefore to the room (10) associated with that output node (60).

Abstract: A building comprising a plurality of rooms (10) includes a room occupancy sensing apparatus. A light source (20) emits a series of light pulses (22), a plurality of waveguides deliver light from the light source to output nodes (60) located in the rooms, and a signal capture unit (30) receives output signals resulting from light reflected by objects in the rooms. The apparatus detects movement, of for example a person (40), in a room and ascertains the room concerned by virtue of (i) detecting a difference between the shape of the waveform of the signal (24 i) received at the signal capture unit (30) in response to a first emitted light pulse and the shape of the waveform of the signal (24m) received at the signal capture unit in response to a second emitted light pulse and (ii) relating said reflected light pulses to the appropriate output node and therefore to the room (10) associated with that output node (60).